Rubbing-wheel.



PATENTED NOV. 1, 1904.

G.L.BADGBR. RUBBING WHEEL.

APPLICATION FILED IAN. 22, 19M.

N0 MODEL.

Invenaor.-

Patented November 1, 1904.

UNITED STATES PATENT OFFICE.

GEORGE L. BADGER, OF QUlNOY, MASSACHUSETTS.

RUBBlNG-WH EEL.

SPECIFICATION forming part of Letters Patent No. 773,535, dated November 1, 1904.

Application filed January 22, 1904. Serial No. 190,117. (No model.)

T0 all whom it may concern:

Be it known that I, GEORGE L. BADGER, ofV

Quincy, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Rubbing-Wheels, of which the following is a specification.

The invention relates to machines for rubbing or polishing the surfaces of stone, marble, and the like.

Polishing-wheels have heretofore been made comprising a cylindrical shell open' at one end and closed at the other end except for a feedopening, the interior of the shell being provided with a series of radially-disposed feedbars leading' from a central bore into which the abrading material is fed and having a series of tangentially-disposed partitions extending between the feed-bars and with the spaces between the bars filled with some supporting material, either wood or plastic material which subsequently hardens. In wheels of this general character as heretofore constructed the abrading material has not been uniformly and properly distributed. l/Vith the radial arrangement of the feed-bars, being at right angles to the line of rotation, there is a tendency for the material to be pushed along in front of the feed-bars in the rotary movement of the wheel and for the larger proportion to remain too near the center instead of being carried outward and distributedevenly over the entire surface or else distributed too slowly. As normally constructed also the interstices between the feed-bars and partitionbars are filled completely with the filling material except for a limited space near the center, and there is no passage for the abrading material to the outer portion of the wheel beyond this limited open space except underneath the wheel.

The object of the present invention is to provide means for more uniformly and quickly distributing the abrading material by an eccentric arrangement of the feed-bars and by providing channels for the passage of the abrading material leading from the central feed-bore outward to the rim of the wheel.

The invention will now be fully described, and the novel features thereof will be particularly pointed out in the claims at the end of the specification.

In the drawings, Figure l is a horizontal sectional view looking toward the upper side. Fig. 2 is a central vertical section on line 2 2 of Fig. l. Fig. 3 is an enlarged sectional view through the ears of the cover, which are connected by a joint with the shaft.

The shell of the wheel consists of a cylinder or annular ring l, having on the upper end a cover-plate 2, secured thereto by screws 3. The plate 2 is formed with a central aperture 4. and with ears 5, to which the shaft 6 is connected by a universal joint. The perforations through the lugs to receive the hingepin 9 of the joint are preferably provided with removable bushings 7, so that it may take up the wear and be readily replaced when worn out, as there is a great deal of wear on this joint. Extending from the rim of the shell inwardly and somewhat inside'of the projection'of the circumference of the central aperture in the cover-plate 2, but eccentrical therewith, are a series of feed-bars tion-bars 10, which are also of the same depth as the shell. They fall short, however, of

Vreaching entirely to the said opposite wall by a distance which is preferably somewhat greater than the thickness of the feed-bars. The partition-bars are secured to the coverplate 2 by screws in the same manner as are the ring l and the feed-bars. The interstices between the partition-bars 10 are filled with plastic material 12 or other suitable substance as far as the ends of the bars, but no farther, thus leaving a series of channels 13 extending from the central aperture 4. to the rim of the shell, this passage being on that side of the feed-bar which is toward the direction of rotation of the wheel, as indicated by the arrow in Fig. l. Surrounding the central opening 4 and projecting upward from the face of the plate is an annular flange 111, forming a hopper through which the abrading ma terial is fed.

By reason of the eccentric disposition or' the feed-bars they engage the material at an obtuse angle to the direction of rotation.

The channels 13 aii'ord an unobstructed passage-way for the abrading material from the feed-opening' outward to the rim of the shell, and the feed-bars 8, by reason of their eccentric disposition, engage the material at an acute angle to the centrifugal movement and. at an obtuse angle to the direction of rotation, thereby causing the material to be quickly and evenly distributed and carried to all parts of the polishing-surface.

15 represents the stone or other surface which is being polished.

The bushings 7 are preferably formed with an annular iiange 16 on the inner ends to prevent them from falling out.

That I claim is- 1. In a rubbing-wheel, the combination of an annular band having a cover for the upper end provided with a central feed-opening for the abrading material, a series of feed-bars extending from the inner periphery of the annular band to and into the said central opening, and a series ot' tangentially-disposed partition-bars between each adjacent pair of feed-bars, said partition-bars falling short of reaching entirely across the space between the feed-bars, thereby leaving a series of channels from the said central opening to the annular band, substantially as described.

2. In a rubbing-Wheel, the combination of an annular band havinga cover for the upper end provided with a central feed-opening for the abrading` material, a series of feed-bars extending from the inner periphery of the annular band to the central opening', said feedbars being eccentrically disposed with relation to said feed-opening, a series of tangentially-disposed partition-|oars extending from each one of said feed-bars and falling short of reaching the feed-bar on the opposite side or' the compartment formed by two feed-bars, leaving a series of feeding-channels from the said central opening to the annular band, substantially as described.

3. In a rubbing-wheel, the combination oi' an annular band having a cover for the upper end removably secured thereto and provided with a central feed-opening for the abrading material, a series of feed-bars removably secured to the cover and extending' from the inner periphery of the annular band to and into the central opening, said 'feed-bars being eccentrically disposed with relation to said feedopening, a series ot taugentially-disposed partition-bars extending from each one of said feed-bars toward the adjacent feed-bar in a direction opposite to the direction of rotation, and falling short of reaching the feed-bar on the opposite side of the compartment formed by two feed-bars, and a filling substance between the partition bars, leaving channels from the inner periphery of the annular band to the central opening, substantially as described.

In testimony whereof I have aflixed my Signature in presence of two witnesses.

GEORGE L. BADGER.

l Witnesses:

GEORGE H. FIELD, JOHN H. DINEGAN. 

